REHVA & CIBSE Ventilation COVID-19 Guidance

Carbon Dioxide Air Quality Monitoring & Life Safety

SKU: CO2 Detector X-1 Categories: ,

Product Description

The REHVA document has recently been updated with new guidance when ventilating commercial buildings, in order to reduce the spreading of COVID-19. Section 4, and section 4.13 of this document discusses the use of carbon dioxide monitoring to give staff members or teachers an indication of ventilation rates in the area.
CIBSE have also released a COVID-19 ventilation guide for buildings. This document states Nondispersive infared (NDIR) CO2 sensors are useful to help assess whether adequate ventilation is being provided to an occupied zone. The Merlin CO2-X is a NDIR sensor which exceeds the guidance set out in both of these documents and is necessary to protect public health, safety, and welfare.

The Merlin CO2-X Monitor features a TFT display to show the user a clear precise reading of the CO2 level in the room and also uses a traffic light colour system to indicate whether the air quality in the room is at a safe, adequate or dangerous level.

The Merlin CO2-X can be used independently or can work in conjunction with one of our Merlin gas safety systems. In the event where the CO2 levels rise to a dangerous level, the Merlin CO2-X Monitor will sound an audible alarm to alert the user of the danger, automatically drive ventilation fans reducing CO2 & temperature as well as shutting off any connected utilities such as gas solenoid valves. An alarm condition can also be communicated to building management systems.

For further information on the Merlin CO2-X Monitor, view our product datasheet or alternatively contact our offices.


Our Monitor is designed to comply with both this document, and also BB101 in schools and comes with a pre-calibrated setting to display the correct warning levels:

•  Green – 0-800ppm
•  Amber – 800ppm-1000ppm
•  Red – 1000+


• CO2 measured and displayed in parts per million (ppm).
• Complies with BB101 – Ventilation of school buildings
• Temperature can be displayed in degrees Celsius (°C) or Fahrenheit (°F).
• 0-10V Signal Output progress bar display.
• Monitor, record and display average CO2 concentration over 8 hour periods.
• User friendly settings menu.
• Pre-alarm and alarm relay output.
• Fan controller enabled relay output.
• Dual power 240V AC or 24V AC.
• End of Life and Fault notifications for CO2 sensing element.
• Automatically switch between ventilation programs when gas is used.
• Boost, Mute and Wake Up button.


• Height – 140mm
• Width – 95mm
• Depth – 30mm